H
- Hall-Scott
- Hall-Scott — U.S.
- Hamilton-Sundstrand
- Hart
- Hartland
- Heath
- Heath-Henderson
- Heinkel-Hirth — Germany
- Walter — Germany
- Helwan
- Hendee
- Herman
- Hermes Engine Company
- Hewland
- Hexadyne
- Hiero Engines
- Hiero - Austria
- Hiller Aircraft
- Hindustan Aeronautics — India
- Hiro
- Hirth
- Hirth — Germany
- Hispano-Suiza — France
- Hispano-Suiza — Spain
- Hitachi — Japan
- HKS - Japan
- Hofer
- Holbrook
- Honeywell — U.S.
- Hopkins & de Kilduchevsky
- Hudson
- Hurricane
Read more about this topic: List Of Aircraft Engine Manufacturers